What category is the 2018 Yamaha YZ125?

The 2018 Yamaha YZ125 has a Category of Cross / motocross.

What type of engine does the 2018 Yamaha YZ125 have?

The 2018 Yamaha YZ125 has a Engine type of Single cylinder, two-stroke.

Is the 2018 Yamaha YZ125 air cooled or liquid cooled?

The 2018 Yamaha YZ125 has a Cooling system of Liquid.

How many gears does the 2018 Yamaha YZ125 have?

The 2018 Yamaha YZ125 has a Gearbox of 6-speed.

How much does the 2018 Yamaha YZ125 weigh?

The 2018 Yamaha YZ125 has a Weight incl. oil, gas, etc of 93.9 kg (207.0 pounds).

What is the seat height of the 2018 Yamaha YZ125?

The 2018 Yamaha YZ125 has a Seat height of 975 mm (38.4 inches) If adjustable, lowest setting..

Yamaha YZ125 - 2018 Specifications and Reviews

Name: 2018 Yamaha YZ125
Brand: Yamaha

The 2018 Yamaha YZ125 is a lightweight 125cc two-stroke dirt bike engineered for amateur and intermediate motocross riders seeking competitive performance. Known for its aggressive power delivery and nimble handling, this machine excels in technical terrain and tight sections where its compact 93.9kg frame becomes an advantage. The YZ125 remains a popular choice for riders developing their skills on the transition between smaller 85cc bikes and larger 250cc machines.

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General information
Category	Cross / motocross
Year	2018
Model	Yamaha YZ125
Engine and Transmission Specifications
Clutch	Multiplate wet clutch
Transmission type,final drive	Chain
Gearbox	6-speed
Cooling system	Liquid
Lubrication system	Premix
Ignition	CDI
Fuel system	Carburettor. Mikuni TMX 38
Bore x Stroke	54.0 x 54.5 mm (2.1 x 2.1 inches)
Compression	10.7:1
Engine details	Reed-valve-inducted
Engine type	Single cylinder, two-stroke
Brakes, suspension, Frame and wheels
Wheels	Dunlop® MX52
Rear brakes diameter	245 mm (9.6 inches)
Rear brakes	Single disc. Hydraulic.
Front brakes diameter	250 mm (9.8 inches)
Front brakes	Single disc. Hydraulic.
Rear tyre	100/90-19
Front tyre	80/100-21
Rear wheel travel	315 mm (12.4 inches)
Rear Suspension	KYB® single shock; fully adjustable
Front wheel travel	300 mm (11.8 inches)
Front Suspension	KYB® Speed-Sensitive System inverted fork; fully adjustable
Trail	109 mm (4.3 inches)
Rake (fork angle)	26.0°
Frame type	Semi-double cradle aluminium frame

Physical measures and capacities
Oil capacity	0.70 litres (0.05 quarts)
Fuel capacity	8.00 litres (2.11 gallons)
Wheelbase	1,443 mm (56.8 inches)
Ground clearance	366 mm (14.4 inches)
Overall width	828 mm (32.6 inches)
Overall length	2,136 mm (84.1 inches)
Overall height	1,295 mm (51.0 inches)
Seat height	975 mm (38.4 inches) If adjustable, lowest setting.
Weight incl. oil, gas, etc	93.9 kg (207.0 pounds)
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Factory warranty	30 Day Limited Factory Warranty
Starter	Kick
Color options	Team Yamaha Blue

Performance Profile & Rider Fit

Best For

Track85%

City5%

Cornering90%

Daily Riding5%

Touring5%

Passenger0%

Rider Profile

Best For	This is a full-on competition motocross bike best suited to intermediate through expert off-road riders who understand 2-stroke power delivery and clutch management.
Purpose	Built purely for motocross racing and aggressive trail riding, not for commuting, road use, or casual leisure riding.
Rider Fit	The tall 38.6-inch seat height, light 212 lb wet weight, and peaky 2-stroke power demand an active, fit rider comfortable standing and shifting body weight constantly.
Character	A raw, high-revving 2-stroke racer that rewards precise clutch and throttle control with explosive acceleration and razor-sharp handling on dirt.
Not Ideal For	Not for beginners, road riders, passengers, or anyone wanting comfort, storage, or long-distance capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2018 Yamaha YZ125 Rider Ergonomics Assessment

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Feet:

At 975mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2018 Yamaha YZ125, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1

MotorcycleDB Review

The 2018 Yamaha YZ125 is a powerful and reliable motocross bike that is perfect for riders of all skill levels. Its 125cc engine provides plenty of power for taking on challenging tracks, while its lightweight and agile design make it easy to handle. The bike's responsive suspension and precise handling make it a top choice for motocross enthusiasts who want a competitive edge on the track. Overall, the 2018 Yamaha YZ125 is a top-performing motocross bike that delivers impressive power, handling, and reliability. Whether you're a beginner looking to improve your skills or a seasoned rider in need of a high-performance machine, the YZ125 is a great choice. With its sleek design and advanced features, this bike is a standout in its class and is sure to impress riders of all experience levels.